Shields

About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.

Accelerator magnet designs using superconducting magnetic shields

Abstract: The possibility of a superconducting shield for accelerator dipole and quadrupole magnets is explored. It is found that the decentering instability associated with iron shields is avoided by the strong diamagnetic shield. In addition, the shield can be much thinner, occupying less radial space in the cryostat. By avoiding the weight and decentering forces of the iron shield, one can reoptimize the cryostat design and substantially reduce the mass which must be cooled to helium temperatures. Promising applications in which these advantages are important are p-p collider interaction region quadrupoles, corrector dipoles for collider detectors, and high-field accelerator dipoles.

Superconducting shields and manufactured ceramic wares of complex configuration

Abstract: A technology has been developed for fabrication of magnetic shields and other high technological wares of superconducting yttrium-barium-copper ceramic by hot casting under pressure. The method enables to form wares of complex configurations and different sizes without any additional machining. The method of hot casting under pressure allows to obtain superconducting shields with a fair homogeneity of the critical field over the shielding length. At working temperature 77, 4K the shields have a threshold screening field H c ∗ about 1.5 mT, high screening factor (S>10 4 ) and low intrinsic noise level ( −6 mT).

Shield machine and method for preventing deformation of side ground

Abstract: PROBLEM TO BE SOLVED: To provide a shield machine capable of easily preventing a collapse of ground on both the sides of a section of an approach to a tunnel. SOLUTION: This shield machine 1 for use in the construction of the tunnel passing underneath a road etc. is equipped with a plurality of main rectangular shields 6 which are vertically and horizontally combined together in a predetermined arrangement and which can be each independently driven, and a plurality of side rectangular shields 15 which are each provided outside the main shields 6 on both the sides in an independently drivable manner and which have a smaller width than the main shield 6. In the excavation of the section of the approach to the tunnel, the side shields 15 are driven in advance of the main shields 6, so that both the sides of the section of the approach can be excavated by means of the side shields 15 and so that both the collapse of both the sides of the section of the approach can be prevented from being caused by that excavated section. COPYRIGHT: (C)2006,JPO&NCIPI

Vapor transport deposition system and method employing removable shields

Abstract: A method and system includes removable shields arranged inside a deposition chamber to prevent vaporized material from accumulating on the walls of the chamber. The removable shields can be removed for cleaning.

Utilizing of shields factors for sedimentation movements and drainage channels at the middle of Iraq (as a case study)

Abstract: The shields factor seems to be a non-dimensional quantity which is utilized to determine the commencement of sediments movement in channels. This study intends to analyze sediments movement in channels of drainage and irrigation in Iraq by utilizing these characteristics as a determinant, and to establish a suitable formula to describe this impact in estimating sediments discharge. Based on seasonal unpredictability of the data, the field and laboratory work was completed across a 36-month period from January 2015 to January 2018. The soil texture was silty sand with a little clay amount, and the specific gravity magnitudes of the soil specimens vary from 2.66-2.73. Furthermore, the Shields factor magnitudes (θ) for movement were greater comparison with the critical magnitudes (θcr) in all channels; sediments transmission has been situated along the channels, according to the research. Using the Shields factor, two logarithmic formulas have been devised to quantify sediments discharge. The Flowing in irrigation channels has a correlation magnitude of 0.9007, whereas the Flowing in drainage channels has a correlation coefficient of 0.644. This demonstrated that the shields factor and sediments transport in irrigation channels had a significant degree of association. The drainage channels, on the other hand, have a significantly lower degree of correlation. This reflects the requirement to design a routine maintenance schedule for certain channels and to ensure that hydraulic Flowing criteria are met.